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http://dx.doi.org/10.9718/JBER.2008.29.6.451

The Stress Concentration Caused by Pin-hole in Femur after Computer-navigated Total Knee Arthroplasty: A Finite Element Analysis  

Park, Hyung-Kyun (School of Advanced Technology, Kyung Hee University)
Kim, Yoon-Hyuk (School of Advanced Technology, Kyung Hee University)
Park, Won-Man (School of Advanced Technology, Kyung Hee University)
Kim, Kyung-Soo (Department of Mathematics, Kyonggi University)
Publication Information
Journal of Biomedical Engineering Research / v.29, no.6, 2008 , pp. 451-456 More about this Journal
Abstract
Total knee arthroplasty(TKA) using computer-assisted navigation has been increased in order to improve the accuracy of femoral and tibial components implantation. Recently, a few clinical studies have reported on the femoral stress fracture after TKA using computer-assisted navigation. The purpose of this study is to investigate the stress concentration around the femoral pin-hole for different pin-hole diameter, the modes of pin penetration by finite element analysis to understand the effects of pin-hole parameters on femoral stress fracture risk. A three-dimensional finite element model of a male femur was reconstructed from 1 mm thick computed tomography(CT) images. The bone was rigidly fixed to a 25 mm above the distal end and 1500 N of axial compressive force and 12 Nm of axial torsion were applied at the femoral head. For all cases, transcortical pin penetration mode showed the highest stress fracture risk and unicortical pin penetration mode showed the lowest stress concentration. Pin-hole diameter increased the stress concentration, but pin number did not increase the stress dramatically. The results of this study provided a biomechanical guideline for pin-hole fracture risk of the computer navigated TKA.
Keywords
computer-assisted navigation; finite element analysis; pin-hole; stress failure; total knee arthroplasty;
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